This is so useful... the current "add random text, save, delete
random text, save" process for creating a blank page isn't elegant.
A small "Create as blank page" button that showed up for new pages
would be so nice :)

Sometimes you want a blank page, eg user and user talk. It happens enough that
the help pages have directions how to create one. It just seems silly that you
can do it ... but to do it you have to add something, and then edit *again* to
delete it.

just because you can do it doesn't mean you should do it or that it should be
encouraged.
a red link is a hint that there is no information there. this applies just as
much to user or user talk pages as to any other page. Why are you helping users
to break this functionality?

Mediawiki is used by a wide range of sites. Some may want that functionality
and not see it as "breaking" anything.
A config option to allow it doesn't strike me as "breaking" anything, it's just
best not to assume because you personally wouldn't want blank pages to exist at
times, others wouldn't either.

Another way of phrasing Ashar's objection (if I can call it that) is that
creating a blank page is, in itself, an inelegant solution to a different
problem. Better than creating a "make me a blank page" button, with its
accompanying disadvantages, would be to analyse what the problem is you are
actually trying to solve.
For instance, you mention User and User_talk pages, so perhaps what you actually
want is a way for these to appear as "blue links" [i.e. exist] as soon as the
user is created? Creating a blank page (or, even better, a page with appropriate
and configurable filler text - e.g. "This user joined on..." for User:,
"Welcome..." for User_talk:) as part of the user creation process is a very
different proposition from letting any user create empty stubs at the click of a
button. I suspect that other uses of such a feature could be similarly reframed
as more specific requests.
Meanwhile, what's wrong with creating a page with a single '.', or the text
"This page deliberately left blank.", or referencing a template containing one
of those - or even referencing a completely blank template? :P

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